JPH0919515A - Falling energy absorbing apparatus to be used for safety tension rope - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a drop energy absorbing device simple to handle and high in reliability by constituting the V-shaped second opening part reduced in a cross-sectional area toward an opening part into which a rope is inserted without play of a narrow part smaller than the diameter of the rope and an inclined edge. SOLUTION: The metal body 24 of a drop energy absorbing device 14 has opening parts 26, 28 allowing a rope 12 to pass and a first opening part 26 is an oval hole capable of passing the rope 12. The distance of the short axis measured in a vertical direction between the parallel edges of an oval is made slightly larger than the diameter of the rope 12. The second opening part 28 has an inverted V-shape and gradually becomes narrow toward the first opening part 26 and the dimensional of the wide part 30 thereof is set so as to be made larger than the diameter of the safety rope 12 and the narrow part thereof is set to a dimensional about half the diameter of the safety rope 12. The side edges 33, 35 forming the intermediate part of the second opening part 28 are inclined to allow the center of the rope 12 to coincide with that of the body 24.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fall energy absorber used in connection with a safety rope and a body having means for passing a rope, and friction between the rope and the rope when the rope slides on the body. The present invention relates to a falling energy absorber that generates a braking force that stops falling.

[0002]

The main function of this type of equipment is to limit the force exerted on the rope when stopping a moving object, such as when a climber falls. Conventional ones generally have several holes in a single metal plate,
A rope is wound around this hole several times. The diameter of each hole corresponds to the outer diameter of the rope.

[0003]

In the prior art, a sufficient braking force cannot be obtained unless the rope is wound around the plate through the hole and wound at least 5 or 6 times, and the attachment to the rope is complicated. It was

Therefore, an object of the present invention is to solve the problems of the above-mentioned prior art, to tie it to a safety rope and to handle it easily regardless of the usage mode such as ropes and handrails, and to provide a highly reliable drop. An object is to provide an energy absorber.

[0005]

In order to achieve the above object, the falling energy absorbing device of the present invention has a means for passing a rope, which means that two ropes (20, 22) are idle. A first opening (26) which is inserted without
The cross-sectional area decreases toward the side with the opening (26) of V
A second opening (28) in the shape of a letter, said second opening (28) having a narrow width (32) smaller than the diameter of the rope 12 and the rope slipping to tighten the winding (34). Sloped edge (3
3, 35).

According to a feature of the invention, the first opening (26) is oval shaped and the first opening (26) is
Is characterized in that its long axis dimension is twice the outer diameter of the rope (12).

With the tightening of the rope passing through the V-shaped second opening and the two ropes passing through the first opening, a sufficient braking force can be obtained only by winding the rope around the body.

According to a preferred embodiment of the present invention, two ropes and a safety cord having a loop at each end are used. Each wheel is provided with stop means for engaging the body at the end of the slip.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a falling energy absorber according to the present invention will be described below with reference to the accompanying drawings. In FIG. 1, reference numeral 10 denotes a safety rope (safety lanyard) used for rock climbing or cave exploration. The safety rope 10 includes a safety rope 12 having a circular cross section and a fall energy absorbing device indicated by reference numeral 14 as a whole. It is used in combination with.

At the end of each safety rope, the strands of the intermediate ropes 20 and 22 are extended to form hook holes or rings 16 and 18 for suspension, and the falling energy absorber 14 is attached to the intermediate ropes 20 and 22. Be connected. Depending on how the safety cord is used, this falling energy absorber may
It may be attached to a harness or safety fixture worn on the body of the user. One of the wheels 16 and 18 is fixed to a safety plate or a handrail provided for fixing the rope to the rock.

In this case, one of the intermediate strands 20 and 22 is in a tensioned state and the other is in a state in which no force is applied. When the wheel 16 is connected to a safety plate or handrail, the strands of rope 20 are taut and the other strand of rope 22 is unforced and sags due to the sagging gravity.
On the contrary, when the strands of the rope 22 are stretched, the strands of the rope 20 are hung down.

2 to 4, the falling energy absorber 14 includes a body 24 made of metal.
Has two openings 26, 28 through which the rope 12 passes. The first opening 26 is an elliptical hole, and the rope 2
You can pass 0 and 22 together. The distance of the short axis measured in the longitudinal direction between the parallel edges of the ellipse is slightly larger than the diameter of the rope 12.

The second opening 28 is a hole having an inverted V-shape, and the distance between the openings is gradually reduced toward the side where the first opening 26 is located. The dimension of the wide width portion 30 of the second opening 28 is set larger than the diameter of the safety rope 12, while the narrow width portion 32 is
It is approximately half the diameter of the safety rope 12 and is wedge-shaped.

The spacing between the side edges 33, 35 which inclines to form the middle portion of the second opening 28 such that the rope 12 is centered on the center of the body 24 is shown in FIG. It corresponds to the diameter of the safety rope 12.

As shown in FIG. 3, the falling energy absorber 1
When the rope 12 is passed through the openings 26 and 28 of No. 4, it is wound so as to form a closed winding 34. The two openings 26, 28 are separated from each other by a spacer portion 36 at the center of the body 24. The axis of symmetry of the body (24) passes through the bottom of V of the second opening (28) and the center of the first opening (26).

Next, the falling energy absorber 1 as described above
The operation of No. 4 will be described. In FIGS. 5 and 6,
When tension is applied properly to the strands of rope 20 as indicated by arrow F1, this tension tightens the winding 34 to engage the narrow portion 32 of the V-shaped bottom of the second opening 28 with the rope. meet. In this position, the rope 12 tightens the drop energy absorber 14 so that the opening 2
The friction with the rope at 6 and 28 generates a braking force to absorb the falling energy.

As a result, when the braking force exceeds a predetermined force, the fall of the user is stopped, and at that time, excessive stress is exerted on the entire safety cord formed by the rope, the fixed safety equipment, the harness and the like. Do not give.

When a sudden tension is applied to the strand of the rope 20, for example, by dropping from a considerable height, the rope slides on the absorber 14, while absorbing part of the energy of the fall. To generate braking force. By the time the loop 18 at the end of the less tensioned rope comes to engage the body 24 and the first opening 26 at the end of the fall, the fall stops and the rest of the fall energy is: It is absorbed by the elasticity of the rope 12 (see FIG. 7).

It is more preferable to provide the suspension wheels 16 and 18 with stop means 40 and 42. The stop means 40, 42 have a curved shape corresponding to the shape of a portion of the ring so as to prevent wear occurring on the ring and prevent the wear from coming off the first opening 26 of the body 24. To present. This bend is directly
6 and 18 (FIGS. 1 and 7) and a protective sleeve 44 made of a plastic material corresponding to the loop is covered (FIGS. 8 and 9).

The sleeve 44 has a circular hole 46 into which a snap hook 48 fits inside the ring. The presence of the sleeve 44 protects the rings 16 and 18, respectively, and helps to attach the snap hook 48 without play.

10 and 11 show a first example of use of the safety cord 10 on the handrail 50. in this case,
The handrail 50 includes cables 50a, 50b, 50c, 50.
It is composed of some part such as d and is fixed to the rock 52 by a bracket 54. The body 24 of the falling energy absorber 14 of the present invention is attached to the harness worn by the climber 56, and the cable 50b is attached to the snap hook 48 at the end of the strand of the rope 20 on which the tension is applied.
Is passed. The strand of the other rope 22 is in a hung state with no tension. Therefore, if the mountaineer 56 falls, the snap hook 48 will have a height A
From the position indicated by arrow F2 to the position of height B fixed by the bracket 54 in the direction indicated by arrow F2, and stops.

The strands of the rope 20 have such a length that they slide through the openings 26, 28 while absorbing the falling energy (shown by the broken line in FIG. 11). This slip will slide until the ramp 42 at the end of the other untensioned strand 22 abuts the stop means provided on the body 24.

12 and 13 show the body 24 in which the safety cord 10 is fixed to the fixing point 58 of the ridge. The strands of rope 20 are connected to rope 60. The safety of the climber 56 is ensured by the jammer 62 cooperating with the rope. The jammer 62 is connected to a climber harness via a link cord 64.
The other strand of the rope 22 is not tensioned. As shown in FIG. 13, when the climber's ridge is down, the falling energy is absorbed by the friction between the climber and the safety tension rope, and then absorbed by the elasticity of the rope 60.

[Brief description of the drawings]

FIG. 1 is a side view of a safety cord to which a falling energy absorber according to the present invention is attached.

2 is a front view of the falling energy absorber of FIG.

FIG. 3 is a cross-sectional view showing a state before tension is applied to the falling energy absorber of FIG.

FIG. 4 is a sectional view taken along line 4-4 in FIG. 3;

5 is a sectional view showing a state after tension acts on the falling energy absorber of FIG.

FIG. 6 is a cross-sectional view showing the falling energy absorbing device on which tension is applied in FIG.

FIG. 7 is a cross-sectional view showing the falling energy absorber that has slid to the end of the tension rope in FIG.

FIG. 8 shows a loop at the end of the rope with a protective sleeve attached.

FIG. 9 is a diagram showing a state in which a snap hook is attached in FIG.

FIG. 10 is an explanatory diagram showing an example of use of the present invention attached to a handrail.

11 is an explanatory view showing a state in which a mountaineer has fallen in the use example of FIG.

FIG. 12 is an explanatory view showing an example in which the present invention is attached to a fixed rope and used.

FIG. 13 is an explanatory diagram showing a state in which a mountaineer has fallen in the use example of FIG. 12;

[Explanation of symbols]

 10 Safety tension rope 12 Safety rope 14 Drop energy absorbing tool 16 Wheel 18 Wheel 20 Intermediate rope 24 Body 22 Intermediate rope 26 First opening 28 Second opening 34 Winding 40 Stop means 42 Stop means 44 Protective sleeve

Claims (10)

[Claims] 1. A body (24) which is tied to a safety cord (10) having a safety rope (12) of circular cross section and which is provided with means for passing the rope through so as to generate a braking force due to friction when sliding the rope. A drop energy absorbing device comprising: a first opening portion (26) through which two ropes (20, 22) are inserted without play, and the first opening portion (26). 26) and a V-shaped second opening (28) having a reduced cross-sectional area toward the side where the second opening (28) is present, the second opening (28) having a smaller width than the diameter of the rope (32). ) And slanted edges (3) to allow the rope to be centered as it slides and the winding (34) is tightened.
3, 35), which is a fall energy absorber. 2. The falling energy absorber according to claim 1, wherein the first opening (26) has an elliptical shape. 3. The major axis dimension of the first opening (26) is
Drop energy absorber according to claim 1, characterized in that it is twice the outer diameter of the rope (12). 4. The fall energy absorption according to claim 3, wherein a major axis of the first opening (26) is orthogonal to a depth direction of V of the second opening (28). Ingredient 5. The axis of symmetry of the body (24) passes through the bottom of V of the second opening (28) and through the center of the first opening (26). Falling energy absorber. 6. The end of each safety rope (12) comprises:
Locking wheels (16, 18) are provided to which the body (24) is connected via intermediate ropes (20, 22), each at the end of which the wheels (16, 18) slide on the rope.
4. A falling energy absorber according to claim 1, characterized in that it comprises stop means (40, 42) for engaging with 4). 7. The stop means (40, 42) comprises a first
Falling energy absorber according to claim 6, characterized in that it has a curved shape which cooperates with the body at the position of the opening (26). 8. A protective sleeve (44) is attached to the curved portion, and the protective sleep (44) is provided with wheels (16, 1).
The falling energy absorber according to claim 7, which is made of a plastic material suitable for 8). 9. The protective sleep (44) has a hole (46).
9. The falling energy absorber according to claim 8, characterized in that a snap hook (48), which has a ring (16, 18), is inserted. 10. The fall energy absorber according to claim 1, wherein the body (24) is made of a metal material.